The unofficial Civilization 7 manual sheds light on various unexplained rules and systems not detailed in the game.Changes in units, settlements, and resources happen at the end of ages, with specific rules on what is kept or lost.Settlement limits, buildings, unit movements, commanders, and wonders are governed by unique mechanics in each age transition.Civilian units, unique abilities, and happiness mechanics undergo changes with each age shift.Naval units' movements, districts, war support mechanics, and conquest strategies have specific guidelines.Player decisions on settlements, religions, unit movements, and resource management significantly impact gameplay outcomes.Leaders' attributes, ideologies, espionage actions, trade mechanics, and town functionalities influence empire development.The manual also covers exploration, artefact research, PC-specific mechanics, and ways to optimize gameplay strategies.Understanding these hidden mechanics can enhance players' strategies and gameplay experiences in Civilization 7.